Mojave template issue

This is killing my life.

I'm trying to essentially rebuild one of the example pages in the mojave template and have a banner image that spreads the full width of the page but like in the stock template, is only about 2 inches tall.

Every time I try this the image instead loads as a full background image and I can't change it's dimensions no matter what I'm doing. I should note that what I'm trying to do is NOT resize the image like you would when you click "edit" and then punch the dimensions in there. I'm trying to get an image to constrain to the stock template banner container.